Cita APA (7a ed.)

Pérez de Gracia Val, E. (1970). John Whiting, a moralist of pessimism. [s.n.].

Cita Chicago Style (17a ed.)

Pérez de Gracia Val, Elisa. John Whiting, a Moralist of Pessimism. [S.l.]: [s.n.], 1970.

Cita MLA (9a ed.)

Pérez de Gracia Val, Elisa. John Whiting, a Moralist of Pessimism. [s.n.], 1970.